Dynamic compaction

1

WHAT IS DYNAMIC COMPACTION?

Dynamic compaction is a technique that is used to increase the density of soils at considerable depths by creating high-energy shock waves. Menard devised and developed the technique in the 1960s.

2

WHAT ARE THESE PROCESSES?

Dynamic compaction requires the use of pounders weighing between 12 to 40 tons released in free fall from a height of 10 to 40 meters. The arrangement of the impact points and the other parameters of the treatment -energies, phasing, rest periods- depend on the characteristics of the soil to be treated and on the results obtained from the initial trial zone.

3

IN WHAT SITUATIONS IS IT USED?

This ground treatment process is used for the foundations of buildings, or to stabilise large areas of embankment work or loose soil.

FAQ

There are structures 20 metres from my worksite; can we use dynamic compaction?
We systematically monitor the vibrations generated on neighbouring structures throughout the project. If need be, preventive steps can be taken (reducing the height of release, installing vibration mitigation trenches) to sharply reduce the vibrations transmitted to neighbouring structures, even at less than 20 m.

For a worksite area of only 1,500 m²; is dynamic compaction still cost effective?
For an urban or a small worksite, a Rapid Impact Compaction system can be used to compact the soil using the same technique as conventional dynamic compaction, but with depths of treatment are generally limited to about 5 to 6 metres.

Some projects' references of...
Dynamic compaction